The Ki-102 Otsu

I don’t think I have heard of Ki-102 having engine armor either. Only Japanese plane which might have had that was Ki-93, but I have not found anything specific about it. Might have been just a consideration.

1 Like

I’m looking for it, but no luck so far.

he mentions engine armor, can’t find good sources on it. But I also can’t read Japanese.

On another note, the backseat armor @Teh0 was talking about is here. The 90 degree plate is 12, the 45 degree plate is 8 mm. Sadly no engine armor is listed here


You even don’t need it if you want to do good historic accurate changes…



1 Like

According to the explanation of the rear gunner’s armor in this diagram, the rear gunner’s canopy is rotatable (回転風防). It is thought to have a similar design to the Yokosuka D4Y. In the game, the field of fire of the Ki-102 Otsu’s rear gunner is unnaturally narrow. The cause of this problem appears to be the rear end of the rear canopy, which is incorrectly configured as a sliding type.

In the D4Y, the rear canopy rotates sideways and retracts into the fuselage to provide a wide field of fire for the turret.


That is fascinating! I didn’t know that.

But let’s see if Gaijin will fix this soon… They still haven’t fixed the rear turret on the Ki-67/Ki-109

1 Like

Is there any source what can help to report it for Ki-102?

I am afraid, without report it will not be soon

1 Like

There doesn’t seem to be any proper photos of the rear gunner’s position with the window open or anything written about how it works.


“KI-102 handling instructions” shed some light to the rear gun position.

Note the “revolving canopy”.


“The revolving canopy turns on the longitudinal axis.”
(Diagram #3 about armor is sadly missing.)


The MG mounting with details.


Few more pages about the rear gunner position.



Awesome! Doing the good work

Would be great if we had proper photos of rear machine gun position. It’s very difficult to tell from these how the canopy rotates, how the machine gun mount moves and how the armor plates are located. It does look like that rounded plate #7 was attached on top of the machine gun. It is only 1.9kg after all. Plate #6 is still very odd.


Otherwise, it doesn’t make much sense. There’s no alignment of the frames where a continuous track allows the third section to slide into the second, nor is there a coherent hinge to enable the pivot necessary for opening, as is typical in such assemblies.

From Ki-48

The revolving canopy would also explain why armor plate 8# is concave on its upper part and not simply rectangular, precisely to allow passage of the canopy.

However, the gun would still be almost completely enclosed within the fixed canopy, which is equally narrow and seemingly mounted to a simple post mount, restricting the gun’s swiveling to the dimensions of the cockpit. In contrast to the D4Y, where not only is the entire canopy released over the gun to avoid collisions, but the gun is also mounted on a movable carriage that repositions along a transversal track, allowing the gunner to reach extreme angles without contortion.

Although, given that we know the third canopy is not over the opening and the seat is adjustable in height, it is likely that it can be raised slightly more than 20º. From side to side, I don’t think so.

1 Like

The plate 6# resembles one of the waist gunner’s armor plates on the PBY. It’s likely to cover only the left side of the gun. If we observe the illustrations, the position of the gun post appears to be off-center, to the right side, due to the space taken up by the ammunition box. Thus, this plate is effectively in the centerline, where the gunner’s head should also be. However, this arrangement would result in the arc of fire not being symmetrical; one side should cover more than the other

The description of the plate 7# states that it belongs to the “rotating windshield” (revolving canopy). Its curved shape corresponds more closely with the curvature of the canopy rather than with a typical gun shield shape. The lower semicircle is to allow passage of the gun. When the canopy opens, the plate flips upside down.

1 Like

Some months ago, @tester188 showed the account of a Ki-148 operator who said that the Ki-102 Otsu had a compartment built in the nose for the Ki-148 radio-control operator to use (at the time of July 1945).

Because of that it would seem that we would need a different Ki-102 Otsu variant in the game in order for it to have the Ki-148 missile.

However, there is a photo series of a Ki-102 Otsu being loaded with a Ki-148 missile. In these photos, it seems that there is no nose compartment, because there is no glass.


So, perhaps in earlier tests, the Ki-102 Otsu used the Ki-148 without any significant airframe modifications. In this case, it would be possible to add it to the plane in the game.

I guess the pilot had to guide the missile while flying, or maybe the person in the rear seat could somehow observe it.


It’s quite possible for these early tests, they were merely trying to test the airframe/missile, without serious consideration as to effectiveness.

That being said, such concerns are unnecessary in War Thunder, so it should definitely receive it.


Kawasaki Ki-102A (Kō) - Suggestions / Aircraft - War Thunder — official forum

Post made by @Grzegames

Hopefully, they’ll look at the Otsu again